/*
 * Copyright 2010 - Jeremie Brebec
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.jb.sharedbills.server.modules;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.inject.AbstractModule;
import com.google.inject.Provides;
import com.google.inject.Singleton;

public class PersistenceModule extends AbstractModule {

	/*
	 * (non-Javadoc)
	 * @see com.google.inject.AbstractModule#configure()
	 */
	@Override
	protected void configure() {}

	/**
	 * 
	 * @return
	 */
	@Provides @Singleton
	public EntityManagerFactory getEMF() {
		logger.debug("createEntityManagerFactory");
		
		return Persistence.createEntityManagerFactory("transactions-optional");
	}
	
	/**
	 * 
	 * @param factory
	 * @return
	 */
	@Provides
	public EntityManager getEntityManager( EntityManagerFactory factory ) {
		return factory.createEntityManager();
	}
	
	private static final Logger logger = LoggerFactory.getLogger(PersistenceModule.class);
}
